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Accessing global variables

HI how to access global variable across files in php.

i am currently working on an application, where i need to take a value from one file to another.. It cannot be obtained through get or post method since it takes some two or three files to render the next view from the form window.

Eg:From the login page it executes four pages to render the next view page

Here, i need to take a value from the second to third page. How can i do it.

I gave in the second file as global $username;

in third file how to access the global variable declared in file2 in file3..